Polishing-machine



(No Model.)

G. P. BUTTERFIELD.

POLISHING MACHINE.

No.268,180.- Patented Nmz s, 1882.

' ticles to be polished.

UNITED ST TES PATE T I Marion. 7

. GEORGE E. ,BUTTERFIELD, 0F sroNEHAM, MASSACHUSETTS.

POLISHING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 268,180, dated November 28, 1882.

Application filed May 3,1882. (No model.) i

To all whom it may concern:

Be it known that I, GEORGE F. BUTTER FIELD, a citizen of the United States, residing at Stoneham, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Polishing Machines; and I do hereby declare that the same are fully described in the tbllowingspecification and illustrated in the accompanying drawings.

The object of my invention is to furnish an improvement on the well-known rotary tumbler or rattler, inwhich it has long been COID' mon to clean castings and the like by tumbling them against each other and against loose gravel, sand, or fragments of metal, the articles to be cleaned or polished and the polishing material being tumbled together in the revolving cylinder usually employed. A serious objection to this old process is that delicate castings and the edges and ornaments of other articles are often ruined by the severe blows they receive from each other in this rude handling, since they may strike with great force and be broken, or the effect of the ornamentation be destroyed. By my improvement the articles to be polished are made fast within thedrum to its inner walls or its shalt, or to interior partitions, whilethe polishing material only is allowed to circulate during the rotation of the hollow drum containing it. With this arrangement the polishing is much more uniform, and there is no danger of marring the articles by inj urious' contact with each other.

My invention consists in a rotary tumbler to contain the polishing material, and having suitable devices for securing internally the ar- It also consists in such rotary polishing-machine having removable peripheral walls or sections, to the interior surface of which the articles are secured.

In the drawings, Figure 1 shows in perspective, and partly broken away, a machine made according to my invention, having its entire periphery removable. Fig 2 shows one of the removed sections. Fig. 3 is a similar machine with sections removable endwise, and Fig. 4 shows a section with articles thereon.

The shaft A is mounted in suitablebearings and arranged to be rotated in either direction, carrying the drum or cylinder B. The ends 0 of this receptacle are made fast to the shaft and solid, to retain the polishing material and so )Oll] the .eri )heral sections, as in Fi 1 a or are hinged to a cross-bar, D, forming a bearing on end support, or otherwise arranged to be opened, as in Fig. 3, so as to permit insertion and removal of t he sections E, to which the articles are attached. Themode of attach ment is immaterial-whether the artithe drum or parts thereof. So of the manner of securing the sections to the tixed parts of the drum, any suitable and conyenient means of union may be adopted. In Figs. 1 and 2 one end of each section is slotted to receive a projecting lug, G, having an enlarged head, while the opposite end of the section is held by a thumb-screw, H. In Fig. 3 the sections slide in grooves longitudinally, and are thus held fast.

The polishing material is that generally nsed-sand, emery, fine bits of metal, Szci, wet or dry, which, by attrition, may serve to polish or clean the surfaces of the articles held exposed to its action. The material may be inserted and removed through a door, J, provided for the purpose, or through the opening made by removal of one of the sections.

The advantage of the removable sections is chiefly due to the greater convenience of securing the articles in position on said parts and changing their position thereon when required.

I claim as my invention- 1. A rotary receptacle for the polishing material, provided internally with means of securing the articles to be polished by the attrition of said materialonly, substantially as set forth.

2. A rotary polishing-machine having removable sections, as described, to which the articles to be polished may be secured, for the purpose set forth.

In testimony whereof I hereto affix my sig nature in presence of two witnesses.

GEORGE F. BUTTERFIELD.

Witnesses:

A. H. SPENCER, E. .A. PHELPS. 

